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ball-and-socket joint

noun
🔊/ˌbɔːl ən ˈsɒkɪt dʒɔɪnt/
🔊/ˌbɔːl ən ˈsɑːkɪt dʒɔɪnt/
(anatomy解剖学)
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  1. a joint such as the hip joint at the top of the leg, in which a piece of bone in the shape of a ball moves inside a curved hollow part球窝关节；杵臼关节